xcodebuild fails with generic destination

Using the following command:

xcodebuild -workspace 'My.xcworkspace' -scheme 'My scheme' -destination 'generic/platform=iOS' -sdk iphoneos

I get the following errors:

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS9.2.sdk/usr/include/sys/cdefs.h:707:2: error: Unsupported architecture
#error Unsupported architecture
^
While building module 'UIKit' imported from /Users/avi/Projects/rounds/iphone/Pods/Target Support Files/GCDWebServer/GCDWebServer-prefix.pch:2:
While building module 'Darwin' imported from /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS9.2.sdk/System/Library/Frameworks/UIKit.framework/Headers/UIKitDefines.h:8:
In file included from <module-includes>:3:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS9.2.sdk/usr/include/copyfile.h:36:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/clang/7.0.2/include/stdint.h:63:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS9.2.sdk/usr/include/stdint.h:52:
In file included from /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS9.2.sdk/usr/include/sys/_types.h:33:
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS9.2.sdk/usr/include/machine/_types.h:34:2: error: architecture not supported
#error architecture not supported
^
While building module 'UIKit' imported from /Users/avi/Projects/rounds/iphone/Pods/Target Support Files/GCDWebServer/GCDWebServer-prefix.pch:2:
While building module 'Darwin' imported from /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS9.2.sdk/System/Library/Frameworks/UIKit.framework/Headers/UIKitDefines.h:8:

The errors continue in that vein until xcodebuild gives up.

As can be determined from the error messages, I am using Cocoa Pods.